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The biggest offender is the Meshlight Soft box I have, second by the Skylight and the Sunlight hardly has Anyfireflys

But with that in mind, the glossiness/specular, which, according to the video on fixing white textures, are insainly high
This is at 9 hours and 900 samples per pixel, 1000x1647px the full image

 

This isn't a cure-all (maybe a cure-most) but after you render A LOT with your Reality/Lux setup, you'll notice that most settings coming out of Daz are really, really not great for Lux's unique abilities. Such that gloss will normally come in at 97% (9700 in Reality), specular colors will be way above 120 (50 or lower is adequate for most materials) and the diffuse for whatever reasons comes in at 210 210 210. This is where the beauty of Reality enters, as full adjustment to maximize Luxrender's engine is easily done in Reality.

As Paolo also noted, you need to learn how Lux treats light, as such controls are more akin to real light and not the Studio version. If you had any experience with an SLR camera before the point-an-shoot revolution, you'll really get great results out of Lux. Light is paint in Lux; learn it, love it, use it.

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